Automatic safety-stop for steam-engines



G. J. SELK.

AUTOMATIC SAFETY STOP FOR STEAM ENGINES.

APPLICATION FILED JAN 24, 1918. v

Patented June 14, 1921.

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AUTOMATIC SAFETY STOP FOR STEAM ENGINES. APPLICATION HLED JAN-24,1918.

1,381 ,756 Patented June 14,1921.

3 SHEETS-,SHEEI 2.

mr use 7' ammmtoz e. 1. 'SELK. AUTOMATIC SAFETY STOP TOR STEAM ENGINES.

APPLICATION FILED IAN-2+, I9IB'.

Patented June 14, 1921.

3 SHEETS-SHEET 3 UNITED. STATES GUSTAV J. SELK, F BEND, OREGON.

AUTOMATIC SAFETY-STOP FOR STEAM-ENGINES.

I Specification of Letters Patent. Patented June 14, 1921,

Application filed January 24, 1918. Serial No. 213,518.

To all whom it may concern Be it known that I, GUSTAV J. SELK, a citizenof the United States, residing at Bend, in the county of Crook and Stateof Oregon, have invented certain new and useful Improvements inAutomatic Safety- Stops for Steam-Engines, of which the following is aspecification.

This invention relates to improvements in a safety device for a steamengine and the invention has more especial reference to an improvedautomatic safety stop or cut-off particularly adapted for use inconnection with steam engines of the Corliss type.

The invention has for its dominant object to provide an automatic stopwhich when arranged on an engine and connected with the speed governingmeans therefor will serve to interrupt the supply of motive fluid to theworking parts of the engine should the driving belt of the governor bebroken or other abnormal conditions be present whereby the speed atwhich the governor is normally operated will be lessened.

Other independent objects are to provide. features of construction ofportions of the device which tend toward the attainment of the above aimirrespective of the relation in which they are used.

Other objects will be in part obvious and in part pointed outhereinafter.

The invention accordingly consists in the features of construction,combination of elements, and arrangement of parts which will beexemplified in the description hereinafter set forth, and the scope ofthe application of which will be indicated in the following claims.

In the accompanying drawings, wherein is shown one of various possibleembodiments of my invention;

Figure 1 is a front elevation ofthe device applied to the speedgoverning means of an engine,

Fig. 5 is a detail in lever.

Fig. 6 1s a view showing the set position perspective of the cam of themechanism before the safety stop is tripped.

Snnilar reference characters refer to similar parts throughout theseveral views of the drawings.

Referring to' the drawings in detail, A

designates generally the vertical stand post or tubular column of a ballweight centrifugal speed governor, usually adapted for use wlthstationary steam engines, and in this instance with the Corliss type ofsteam engme, and within the stand post or column is arranged the rotarygovernor driving shaft B, which at its upper end is fitted with asuitable head having pivotally connected therewith the usual opposedswinging governor arms G carrying'the ball weight members D the latterbeing located at or near the free ends of said arms, while surroundinthe governor shaft 13 is the sliding sleeve having the toggle linkconnections F with the 3 governor arms C so that on movement-of saidgovernor arms inwardly toward or outwardly away from each other in theoperation of the governor the sleeve Ewill be the operation of thelatter willbe controlled automatically on the activity of the governorin the working thereof in the usual V611? known manner.

(Jo-acting with the governor is the automatic safety stop device, whichcomprises a bracket 4 made fast in any suitable manner upon the standpost or column A and includes opposed laterally extending hangers 5 onwhich are swingingly supported rock ing arms 2 and .3, having toothedsegments 6 and Trespectively which are in .Ineshing.

engagement with each other, the arm 2 being fixed to a stubshaft 6journaled transversely in one Of the hangers 5, while the 2 arm 3 isloosely engaged for rocking movement upon a stub shaft 7" journaledtransversely in the other hanger 5. Secured to the stub shaft 6 andloosely supported upon the stub shaft 7 are weighted trip arms 8 and 9respectively. The arm 8 is fitted" with an auxiliary weighted element10, while the arm 9 is fitted with a main weighted On the arm 9 is atrip horn element 10'. 11 formed with a beveled tripping nose forcooperation with a tripping latch or catch 13, pivotally mounted upon asett rod 14, the latter being formed with elongated slot 15, receiving aguide bolt 16' carried by a guide 17 made fast to one of the hangers 5.The setting rod 14 is pivotally engaged with a spring 18 fixed to athrottle valve casing H shown in Fig. 3 of the drawings, the stem 20 ofthe throttle valve in said casing H being manually operated and isfitted or formed with an abutment collar 21 constituting trip device toco-act with the setting rod 14, so that when the stem 20 is movedoutwardly of the valve casing H for opening the valve therein, wherebysteam will be supplied or admitted to the engine (not shown) for theoperation of the latter, the said abutment collar 21 will engage withthe setting rod 14 for shifting the same against'the resistance of thespring 18, and in this shi'fting'movement of said rod the latch orcatch13 is positioned for operation with the safety stop device,hereinafter more fully described. v

Carried upon the governor stem G is a tripping cleat or cross head 23adapted for tripping engagementwith the latch or catch 13 on movement ofthe governor stem G a predetermined distance. The latchor catch 13 wheninfits operative or set position relative tothe safety stop. device isarranged so that on moving the swinging arms 8 and .9 to the vertical orperpendicular position,

the horn 11 on the arm 9 will ride over the said latch or catch 18. Nowwhen the tripping cleat 23 rides down and strikes the projecting end ofthe catch 13, the inclined face 12 coacts with the left hand end 183 ofthe member 13 and prevents clockwise rotation thereof. This initialmovement will throw the arm 9 past the dead center and asitfallsoutwardly and downwardly'the' latter isshifted from. vertical positionafter moving a predetermined distance,itwill en gage the head or member22 to cause the arm 3 to be shifted or moved simultaneously with saidarm 9 and on movement of the arm 3 through the meshing engagement of thesectors 6 and 7 with each other, the arm 8 will also be shifted fromperpendicular position through the medium of the arm 2 and the movementof these arms 8 and 9 from normal perpendicular position shown in Fig.2, when the automatic stop device is inactive to the position shown inFig. 1 of said drawings renders the said step device active for thescribed.

purpose presently de-,

Connected with the stub shaft 6* is a compound throw lever 2 1,. whichlatter is pivoted at 25 to the guide 1'? while fixed to the stub shaft 7IS a rocking lever 26, the latter being connected to the stem G of thegovernor through the medium of a con pling bolt 27 so that on theshifting of the said stein Q in the operation of the governor the arm 26will be moved thereby, the lever 24 being located relative to'the arm26to act upon the same on the swinging of the arms '8 and 9 of the safetystop device fora purpose hereinafter de fribed.

Carried upon the stub shaft 7 adjacent to the arm 3 is a rocking beam28', which latter is suitably connected with the arm 3 for movement'therewithso that on the turning of the latter, said beam '28 will beactuated thereby.

Pivoted to the ends'ottherocking beam v shown by full lines in 1 andbydotted lines in Fig; 4i, in the operation of the automatic safety stopdevice effects the action or the lever 24 upon the arm 26, connectedtothe governor stem Gso to abnormally burden the governor and also therocking beam 28 is simultaneously actuated for the shifting of the rods29 connected with the engine controlling valves to close the latter andthus stop the working ofthe enginei When the weighted arms 8' and 9 aremoved from perpendicular position outwardly and downwardly an upwardthrust upon the arm 26 is had through the com pound lever 24, under' theaction of the weights 10 carried by said arms 8 and 9 and thus thegovernor stem Gr will be raised for abnormally burdening the governorat' the timethat the controlling valves are closed for the stopping ofthe engine and the said safety stop device is operative only when thedriving connections between the governor and said engine become brokenor inoperative and when the working parts of the engine become damagedand unduly affect the operation ofthe engine.

In the working ofthe automatic safety stop device in connection with thegovernor and the engine, the normal positionof the safety device has theweighted arms 8 and 9 thereof disposed perpendicularly as shown in fulllines inrFigs. 2 and 4 of the drawings so that the governor stem G willoperate in the usual well-known. manner when the en-' red 14, so that-thlatteris shifted to bring I the latch or catch 13 into position for theengagement thereof withthe horn 11 on the swinging arm 9, when in itsperpendicular position, and also to locate the said latch or catch13 inthe path of movement of the tripping cleat or cross head 23 on thegovernor stem G.

Then the engine is working under ordinary conditions, the governor isoperated to control the speed of the engine. Now should the drivingconnections between the engine and the governor become disturbed, brokenor otherwise ineffective, the governor stem G of the governor lowers toan abnormal degree, by the governor'arms G dropping so that the trippingcleat or cross-head 23 will act directly upon the tripping latch orcatch 40 13, rocking it upon its pivot causing said latch or catch toact upon the horn 11 at the beveled nose 12 thereof for initially movingthe arm 9 causing it to swing outwardly and under the action of the tripweight 10' thereon the same will drop downwardly from perpendicularposition to that shown in. Fig. 1 of the drawings by full lines and bydotted lines'in Fig. 4 of the drawings. During the movement of the arm9, corresponding movement is imparted to the arm 8 due to the meshingengagement of the toothed sectors 6 and 7 and in the movement of the arm9 it engages the striking head 22,

the governor stein G causing the latter to be moved upwardly and therebyswinging the governor arms, C with the weighted members D thereonoutwardly and in this man ner the governor is actuated to abnormallyburden the engine for retarding the speed of the working parts thereofso that the same will be brought to a quick standstill. It is of courseunderstood that in the use of the automatic safety stop device the sameis "manually set to bring'it to normal inactive position with the arms 8and 9 thereof, disposed perpendicularly as shown by full lines in Figs.2 and 4 of the drawings, the governor being active under normalconditions with the engine in the ,usual manner and said safety stopdevice becomes operative only when abnormal conditions ariseor theconnections between the governor and said engine become ineffective,broken or damaged. i V

Mounted 011 the stand post orcolumn A of the governor are suitable shockabsorbers- 34, disposed in the path of movement of the sectors 6 and 7sothat on'thc dropping of the arms 8 and 9 of the safety stop device,the said sectors 6 and 7 will engage'with the shock absorbers to limitthe dropping movement of the said arms 8 and 9 under the burden of theweights l0 and 10 thereon and in this manner the governor arms will notbe unduly burdened when the safety stop device is active.

Manifestly, the construction shown is capable of considerablemodification and such modification as is within the scope of my claims,I consider within the spirit of my invention.

I claim 1. In combination with the speed governing means of an engine,weighted pivotal means supported on the engine, trip means engaged withthe weighted means and operable upon movement of the speed governorsstem for actuating the same, cut-off valve operating means, and meansconnected to said cut-off valve operating means adapted to be actuatedby the pivotal weighted members upon their release for movingthe cutoffvalve to closed position.

2. In combination with the cut-off valve and the speed governing meansof an engine, said cut-off valve having connection with the stem of thegoverning means, weighted pivotal means supported in proximity to thegoverning means, trip means engaged with the weighted means and operableuponmovement of said governor stem for actuating the same, and meansengaged by said armsupon movement to their lowermost positions for 125causing operation of the cut-off valve connection and permitting thevalve to be moved to its closed position.

3. In combination with the cutoff valve and speed governing means of anengine,

same, and means engaged with the remaining pivotal member adapted to beengaged with and operate saidcut-oft valve connection upon movement ofthe pivotal members to their lowermost positions;

4:. In combination with the throttle valve, cut-off valve and speedgoverning means of an engine, a pair of pivotal weightedarms su orted in)IOXiIIllt to said 'overnin l y a: a

means, slidable trip means actuated upon movement of the throttle valvefor connecting one of the pivotal arms to the stem of the speedgoverning means, said stem being adapted to disengage the slidabletripping means upon the presence of abnormal conditions,fmeans operatedby, said pivotal weighted arm for imparting motion to the remainingpivotal weighted arm, operating means connected to said cut-ofi' valve,and

downward movement thereof for causing said cutoff valve to be moved toits closed position.

5. In combination with the throttle valve, cut oif valve and speedgoverning means of an engine, "a pair of interengaged pivotal weightedarms mounted inproximity to said i governing means, shdable springpressed trippingmean-s supported adjacent one of sald arms and operatedupon movement of the throttle valve for releasably connecting said armsto the stem of the governing means, a rotatable trip engageable with thecut-off valve, cam means engageable with said rotatable trip havingpivotal connection with the stem of the governing means, and meansconnected to the remaining pivotal weighted arm engageable 'with saidcam operating means upon movement of the same to its lowermost positionfor causing said cut-off valve to be moved to closed position;

In testimony whereof I affix my signature hereto.

GUSTAV J. sELK,

